Rotary swaging machine



April 28, 1953 5. SMITH ROTARY swAGING MACHINE Filed' March 18 1948 l lf l r www Patented Apr. 28,n 1953 OFFICE ROTARY SWAGING MACHINE SamuelSmith,fEhndon, England Applieaun March-"1s, 194s, serial No. 15,535 InGreat Britain March 18, 1947 The present invention has relation torotary swaging or forging machines more particularly those of `the typein which a stationary spindle or central diehead is provided withradially displaceable die blanks which are acted upon by a rotatableiiywheel or like device mounted upon the spindle or central diehead withthe intermediary of a plurality of circumierentially dis posed rollers,the present invention having for its object primarily to provide for theemcient mechanical operation of the die blanks in the stationary spindlewhereby they may be opened and. closed to suit a particular piece ofwork and to operate at a predetermined setting. With the presentmechanism inview of the fact that the dies merely reciprocate it ispossible to pro'- duce square or other non-circular sections orformations.

According to the present invention a rotary swaging or forging mechanismof the type hereinbefore referred to and having a stationary spindle orcentral diehead surrounded by a rotatable iiywheel is provided with aplurality of wedges slidable in relation to the said body and interposedbetween the die blanks and the hammer blocks, said wedges beingadvantageously interconnected and having remote control. Further thestationary diehead may carry wedge members calculated by theiradjustment to limit the movement of the hammer blocks.

In order that this invention may be clearly understood and readilycarried into practice reference may be had to the appended drawings,upon which:

Fig. 1 illustrates in vertical sectional elevation a rotary swaging orforging machine constructed according to the present invention, and

Fig. 2 illustrates the machine from a frontal aspect in part sectionalelevation.

In a convenient embodiment of the present invention a stationary hollowspindle a is suitably mounted in a pedestal b which forms the body ofthe machine, the spindle at its extremity being provided with a dieheada1 which may be integral therewith or detachably secured thereto. Thediehead is provided with at least one central transverse die slot a2across its face, each radial section of which carries a dieblank c andhammer block d, the said hammer block being adapted to receive blowsfrom the annular rolls e mounted in abutting relation to each other in achannel intermediate the diehead f and the diehead a1 and adapted torotate therebetween. The diehead ,f is accordingly adapted for rotationrelative to the stationary diehead a1. As illustrated 1 claim. (c1.V vs-22) the diehead is provided with four radial slots adI at right anglesto each other and carry eight diepieces which are mitred together at thecentre and are formed at their working faces to produce square,rectangular and swaged or other forged sections, but three die slots maybe provided each having two piece dies to suit the production of certainsections and any desired number of die heads and dies may be usedfor'partlcular jobs such .as the luting of reamers and the like. Therotating ywheel or like device f carrying the rollers e may be groovedfor a V-rope or` other suitable drive,langes f1 being provided tosustainside thrust. In order to provide suitable means for maintaining pressurebetween the dies and the hammers, wedges g are interposed and the innerextremities of the wedges being engaged with a circular disc g2 mountedon a rod or tube g3, termed a wedge-carrier, within the spindle a of themachine. Lateral movement of the wedge-carrier g3 is controlled andadjusted by means for example of a bell-crank lever g4 connecting with alink g5 operated by a pedal lever gs so as to provide the desiredpressure between the dies and hammers, or alternatively any suitableform of linkage or other mechanism may be provided for axiallydisplacing the wedge carrier g3 for the purpose of this invention.

In some instances it is desired to displace the wedge-carrier g3 asubstantial distance. This not only permits displacement of the dieblanks c for the introduction of an` article to be forged, but allowsclearance between g2 and the adjacent part a3 of the head for any heador enlargement on the article being forged, that is to say, g2 and g3are substantially removed to permit as for instance of the centre partof a length of rod being forged or swaged in some particular mannerwithout detriment to its inner or outer extremities.

As previously stated the wedge-carrier may be controlled by means oflinkage g1 g5 and this may be operated by a foot pedal or lever gs, theoperation of which withdraws all the wedges g simultaneously and permitsthe full entry of the stock between the dies. A reverse movement of thewedges g takes up the slack and swaging or forging can then take place.It is highly important to restrict and control the amount of die openingand to ensure that the dies open an equal amount through their wholelength. In order to do this a wedge or cotter h is interposed betweenone side of each hammer block d and the wall of the head a1 in asuitable tapered recess, the said wedge or cotter 'being controlled byan adjusting screw and locknut h1 h2 in the die head so that the cotterh restricts the outward movement of the hammer. The number of annularrollers e in the machine must be equally divisible by the number ofhammers d in the die head, for example: if there are four slots at rightangles as illustrated and four hammers d, the machine must carry eithereight, twelve or sixteen rollers e. or any number in multiples of four.When the machine is used for hot working it is desirable to introduce anair blast on the dies to remove scale.

By means of such a machine as herein described it is practicable notonly to carry out hot swaging and pointing operations such as thetanging of files, hand tools, spikes, barrow forks and the like but highprecision cold swaging such as fluting and squaring taps, reamers andthe like.

By providing a suitable feeding attachmen which will offer the stock orblank tothe swaging dies at a pretermined speed of feed and r0.- tation,spiral grooves may be swaged such as are used in twist drills and thelike, the swaging dies being suitably shaped to produce the desired formof groove.

lclaim:

In a rotary swaglng device the combination comprising a stationaryhollow spindle, a head xedly secured to said stationary spindle havingformed therein a plurality of radially disposed slots located in spacedangular relationship, a plurality of hammer blocks and die blanks, eachblock and blank being arranged in axial alignment and movably positionedin one of said slots, a iiywheel supported by said stationary spindlefor rotation in a plane transverse to the axis of said spindle, aplurality of rollers located within a channel intermediate said flywheeland said xedly secured head and positioned to contact an end of saidhammer blocks and exert pressure thereon in an axial direction duringrotation of said flywheel, a plurality of rst movable wedges, each ofwhich being positioned intermediate one of said axially aligned hammerblocks and die blanks, a carrier member connected to each of said rstmovable Wedges, an actuating member connected to lsaid carrier memberand reciprocable in a di- References Cited in the file of this patentUNITED STATES PATENTS Number Name Date 1,480,077 Johnson Jan. 8, 19241,507,621 Perry Sept. 9, 1924 2,126,923 Romanelli Aug. 16, 1938 FOREIGNPATENTS.

Number Country Date 23,485 Great Britain Oct. 22, 1896 570,734 GreatBritain July 19, 1945

